Guys:

Good advice has been given here.

The big concern now is that of construction activity in addition to the ordinary safety concerns around railroad operations.

Consider what you would take into account if you were photographing around bridge construction along a freeway.

In Cajon Pass, access is much easier than the typical freeway interchange and, consequently, more care ought to be taken when contemplating railfan activity.

When working in a construction zone, proper gear is worn, and safety training is required. The awareness factor is ramped up considerably - especially for us surveyors!

The best response (beyond responsible movements in safe areas) is to state that you are there to document a historic series of events.

Enjoy your visits and, hey, let's be careful out there! (to quote a famous Sergeant)

Warren