Hi! 
It could be a paved brick road, or if you’ve ever heard of scoria brick (slag bricks that were pored into molds - may account for the metallic sparks etc.) it might be that... the Virginia Ave Tunnel in DC is a good example of these that was excavated by Parsons (Henry Ward). The construction was circa 1870s. 
Another possibility would be your initial thought - trolley tracks at least in SW PA can be easily missed as a result of when an area is mapped and their sometimes short-lived duration. 
Best of luck!
Angie

Angela S. Jaillet-Wentling, M.A., RPA
PENNDOT Cultural Resource Professional
Engineering Districts 11-0/12-0


724.699.2874 
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> On Jul 9, 2018, at 12:46 PM, William White <[log in to unmask]> wrote:
> 
> There is a brick roads historical context for the state of Washington.  This might be a paved over brick road
> 
> Bill white
> 
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> ________________________________
> From: HISTORICAL ARCHAEOLOGY <[log in to unmask]> on behalf of Elizabeth Davoli <[log in to unmask]>
> Sent: Monday, July 9, 2018 12:01:30 PM
> To: [log in to unmask]
> Subject: Re: Mystery feature
> 
> Brick road that was paved over?
> 
> 
> Elizabeth L. Davoli, RPA 10999
> Coastal Protection and Restoration Authority
> Coastal Resources Scientist Manager| Planning & Research Division
> The Water Campus | 150 Terrace Avenue | Baton Rouge, LA 70802
> o: 225.342.4616
> www.coastal.la.gov<http://www.coastal.la.gov>
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> -----Original Message-----
> From: HISTORICAL ARCHAEOLOGY [mailto:[log in to unmask]] On Behalf Of Stephanie A. O'Brien
> Sent: Monday, July 09, 2018 10:17 AM
> To: [log in to unmask]
> Subject: Mystery feature
> 
> Can anyone help identify this feature? It was discovered under approximately 6 inches of cement on a road that has existed since at least the late 1800s. They are currently doing road construction in the area, and when the contractor was cutting the cement, two sections of metal were discovered. The contractor was able to cut a wedge out of the asphalt and expose one section the metal (see photos at link below). Surrounding the metal is a brick, each with an indentation, on either side of a metal section with a matching indentation. Based on the sparking of the saw, the same arrangement of brick and metal occurs approximately 2-3 m away (as if it was a rail) and again, 20 m further up the road, two parallel areas also sparked, also indicating an arrangement like a rail. I have consulted historic maps and there is no indication what this feature is. They do not look like trolley or railroad tracks and no tracks appear on any of the maps I consulted. Due to safety concerns (opening a large hole in the pavement when traffic is still passing in the next lane), the contractor could not remove a larger section of asphalt at this time.
> 
> This was found in southeastern WA.
> 
> https://photos.app.goo.gl/d6CmC4pDrKwTXHm88
> 
> 
> Any help would be greatly appreciated!
> 
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