Environmental side - using oil as fuel

As yes, the environmental side of using oil as fuel. As Greg experienced:

The downside from a fan/worker perspective is that all the yards and engine facilities had these globs of oil all over the ground, and it was a mess on your shoes.
The roundhouse areas and steam facilities were sometimes covered with this stuff.

If the D&S elects to have 1,320 gallons or more oil storage capacity at any one facility, (excluding material in 55 gallon drums) it will come under federal requirements for Spill Prevention, Containment and Countermeasures. This is a Clean Water Act thing, aimed at avoiding oily runoff into "waters of the United States", which includes almost any little creek or gully. Primarily, these rules involve adherence to an SPCC Plan (developed by the facility), a fact of life at many industrial sites. Storage tank and fueling rack installations, with spill prevention and containment measures, are just the start.

Bad housekeeping as Greg describes is verboten. For strict compliance, any visible spill outside of the containment basin is to be cleaned up promptly. I'm sure large RR fueling and service facilities are to comply with this, but I don't have first hand experience regarding how well it is followed.

Sorry to bring up another onerous connection between real world and historic RR world.

Bob of AZ