There is an active diamond, that's viewable from the the end of W. Pine St. Anything entering / leaving Olean Yard from the East, South, or North passes through this diamond. (Although, the line to the North has seen very little traffic in the past year or so). It's known as CP Olean on the RR.
Also, nearby is the former PRR shop and roundhouse complex, that is now inside the fence of Dresser Rand Corp. These buildings are visible, from a distance, along Vine St. The main entrance (and guard shack) for Dresser Rand is at the intersection of Wayne & 12th St. They keep their 45 ton GE centercab behind the guard shack. You can usually see it there, but it's too far back (several hundred yards) for any kind of decent photograph.
The former PRR depot is at N. Union St., and can be seen from the Mall parking lot. The canopy along the tracks has been significantly altered from its PRR days, but the building remains intact.