Roads built atop former railroad grades and named after them

[Max Rockatansky]

In the town of Auberry, California there is a San Joaquin & Eastern Road (shorthanded to SJ&E Road).  Said roadway was built on top of the grade of the namesake San Joaquin & Eastern Railroad.  This line was used to haul materials to the site of Huntington Lake circa 1912-1933.  Notably the railroad grade was said to have 1,073 curves and apparently a grade as high as 5.3%.

0 by Max Rockatansky, on Flickr

[jay8g]

S Milwaukee Dr in Port Angeles is built on what was once the Milwaukee Road tracks.

[Mapmikey]

VA 309 meets this criteria. Built over the W&OD railroad. VA 309 is Old Dominion Dr.

[mgk920]

'Railroad Grade Rd', just west of Fremont, WI, was built on a former 'almost' railroad grade that was never completed due to the paralleling now CN mainline having been completed a few months earlier.

Mike

[GaryV]

I believe Lewiston Grade Road near Hartwick Pines State Park in north-central Michigan was once a narrow-gauge railroad.

[kalvado]

Tangentially related one: few upstate NY cities have Erie Blvd. built on top of an old alignment of Erie canal

[-- US 175 --]

US 75 (the current alignment) north of downtown Dallas was built on the former Houston & Texas Central RR track as North Central Expwy.  US 75's former freeway alignment south of downtown also was built on the Houston & Texas Central track as South Central Expwy. (since renamed S.M. Wright Frwy., for a local influential pastor).

Meanwhile, the original east-west RR in the downtown area, the Texas & Pacific, ran down the street now known as Pacific Ave.

[Bitmapped]

Greene County, PA has WW Road, which follows the former Washington & Waynesburg Railroad.

[hbelkins]

There are a few "Old Railroad Grade" roads/lanes (county routes) in Kentucky.

[wxfree]

In Austin, Texas, Loop 1 is build on an existing railroad grade, with tracks in the freeway median.  It's a Union Pacific line, originally Missouri Pacific, and the road is called MoPac Expressway.  It isn't a former grade, but it's a former railroad, so it slides in on a technicality.

The FM 1713 bridge over Whitney Lake between Hill and Bosque Counties is called Katy Bridge.  It's named after the Missouri-Kansas-Texas Railroad, called MKT and shortened to Katy.  The original bridge was replaced with a higher one when the dam was being built in the early 1950s.  The 1968 map shows the railroad abandoned.  The 1968 minute order extending FM 1713 directs the engineer to purchase the bridge for $25,000.  It looks like they replaced the bridge deck with one suitable for a road.  This name doesn't apply to anywhere else on the road, just the bridge.

Along the same line in Whitney, it looks like they named a street on the old grade Railroad Avenue.

[epzik8]

WB&A Road in Severn, MD along the old Washington, Baltimore and Annapolis Railroad

[Max Rockatansky]

Someone pointed out PFE Road in Roseville, California as an example of the titular phenomenon to me off forum.

[freebrickproductions]

Old Railroad Bed Road in northern Madison County, AL, was originally built as a rail line intending to connect the cities of Decatur, AL, and Fayetteville, TN. The company originally building it only got as far as the Harvest area* before going bankrupt. It was taken over by the NC&StL after that, who operated it as a branch line up until the 1929, likely being put-out of its misery when the stock market crashed that year if I had to guess.
https://www.abandonedrails.com/middle-tennessee-and-alabama-railway

*Amusingly, they'd started grading their right of way at the south end on the other side of the Tennessee River from Decatur, and would've hooked into the Memphis & Charleston's line (present day NS Memphis District East End) at about the same spot that the Nashville & Decatur's line (later L&N) originally hooked into it to cross the river, prior to the L&N building a causeway out to shorten the length of their trackage rights across the river and straighten their line, leading to the current location of Decatur Junction between the CSX S&NA North Subdivision and the NS Memphis East. You can see both alignments on satellite imagery still, the MT&A's unfinished line being the graded section in the middle between the current NS line and the N&D's ROW curving off due north:
https://www.google.com/maps/@34.6322019,-86.9601537,1249m/data=!3m1!1e3?entry=ttu&g_ep=EgoyMDI1MDQwNi4wIKXMDSoASAFQAw%3D%3D
As a side note, Sandy Road just north of there is also built over the N&D right of way, though the name doesn't reflect the heritage of the ROW. You can also still make-out the remnants of the grade for the temporary wye that the Union put in there in the civil war, so that way they could get trains between Nashville and Chattanooga while avoiding raids by Confederate soldiers on the NC&StL's line to Chattanooga (the present-day CSX Chattanooga Subdivision).

Not too far away over in Hartselle, parts of Railroad Street are built over the S&NA's original mainline through the city, which was bypassed with a slightly longer route when the L&N added the Hartselle passing siding:
https://www.google.com/maps/@34.4302909,-86.9269554,2291m/data=!3m1!1e3?entry=ttu&g_ep=EgoyMDI1MDQwNi4wIKXMDSoASAFQAw%3D%3D

Finally, over in Hobbs Island, AL, part of the NC&StL's line through Huntsville (and down to Gadsden; later the L&N Huntsville Branch), just past the current south end of the Huntsville & Madison County Railway, was built over with a new subdivision. The ROW of the former line was built into the one of the roads of this subdivision, and is fittingly named Railway Lane:
https://www.google.com/maps/@34.5497501,-86.538989,1013m/data=!3m1!1e3?entry=ttu&g_ep=EgoyMDI1MDQwNi4wIKXMDSoASAFQAw%3D%3D

[Dirt Roads]

West Virginia has the infamous Twelvepole Line, which includes the 3,327-foot Dingess Bore and the much shorter 347-foot Breeden Tunnel, both now serving as one-lane road tunnels. 

Previously part of the Norfolk & Western Railroad's original mainline between Bluefield -and- Ceredo, this winding railroad was far too difficult to expand as the N&W opened up new coalfields in the western part of the state.  The Twelvepole Line was abandoned between Lenore -and- Wayne in 1933 and quickly converted to state roads, some 54 miles in length.  Several of the original bridges have been replaced and some sections abandoned.

At the south end in Mingo County, the road is called "Old N&W Railroad Bed Road" (CR-3/5).  Upon entering Wayne County, the road changes to "County Road 41", locally referred to as "the Old Twelvepole Line".  As the road approaches the settlement at Doane, it changes over to "Twelvepole Road" (CR-35).  At the town of Missouri Branch, it becomes the original routing of US-52 and runs parallel to modern-day WV-152.  But as it crosses over WV-152, it becomes "Right Fork Dunlow Bypass Road" and as it approaches the town of Dunlow, it becomes "Old Railroad Road".  Beyond Dunlow, it becomes "Radnor Hill Road" , which soon ends. 

Further north, it picks up again near Quaker (once again parallel to WV-152) as "Old N&W Railroad" (many maps incorrectly show this as "Old New Railroad"), drops out again, and then picks back up near Ferguson as "Old N&W Railroad Road".  After losing a couple of original bridges in Genoa, it picks up once again with same name.  North of Sidney, WV-152 follows the Twelvepole Line (but the road is locally referred to as "State Road 152") all the way up to Wayne.

[hbelkins]

I drove through the Dingess Tunnel a couple of years ago from the WV 65 end, and ended up at WV 152.I seem to remember a much shorter tunnel than the Dingess Tunnel along the route.

[dantheman]

There are at least three Old Colony Roads in southeastern Massachusetts, all named after the Old Colony Railroad and placed on old alignments of one spur or another. These are in Harwich, MA; Hyannis, MA; and Mansfield, MA. The Harwich and Mansfield ones are in line with rail-to-trail bike trails that continue on the old alignments.