As a point of curiosity, would anyone happen to know who owns the present day right of ways of both the Erie/Erie Lackawanna and the Lehigh Valley northbound from the present day configuration of what is/was known as Mortimer Junction. This right of way leads into downtown Rochester.
The second part of your question is easy: Mortimer Junction no longer exists. All switches and crossings were removed. CSX and the LA&L run parallel until the LA&L turns South down the former LV. There is no remaining sign of the Erie ROW south of the junction except for two curb cuts along Jefferson road. Those will disappear once the planned reconstruction of Jefferson Road begins.
North of the junction, there is a hiking/biking trail that shifts between the two a couple of times. There are power lines along both. Once both ROWs enter the UofR property, they are in use by the college until you come to the bridges over the road and the Genesee River. North of the UofR, the LV is a trail along the river up to the subway entrance. I have not ridden along it since the I-490 bridge construction began, so I don't know what it looks like now in that area.
After crossing the river, the Erie ROW becomes the Greenway trail, until it vanishes at the site of the recent housing/retail development on West bank of the river.
Here's an aerial view of the former junction from Microsoft's Live Search Maps site:
http://maps.live.com/default.aspx?v=2&c ... &encType=1
Hope this helps.
Hope this helps.