Terrapin Station wrote:How about answering the question?
He did, you just didn't like the answer.
Think about it.
If you're running a train in revenue service, there's toilets on the train in the passenger section. Make an extended station stop, rush to the nearest car with a toilet.
Yard switchers don't need toilets, cause you can get out and go to the bathroom if necessary in a nearby yard building.
If you're transferring rolling stock from one location to another along the line, you can stop and run into a station to use a toilet (though there aren't that many open station buildings anymore, but that's another topic entirely).
But if you're on a work train, shoving around hopper cars in the middle of nowhere all day, re-ballasting the line, it's a workforce health and dignity issue to make sure there's a toilet available. Its not sanitary for people to just defecate in the brush on the side of the ROW, thus the FRA rule.
So, the BL-20GH's are used for revenue service on the branch lines, yard switching, transfer service from one yard to another and rescue service (like the AMMO/PMMO).
They aren't used in MOW work service, like the wire train or re-ballasting.
Is that clear enough of an answer?