What else?

"But after the current six engines are running and then the 483 and 492 are running, what else will we have to work on but the 494 and 495?"
I'd say those eight you refer to will keep quite a few people employed full time, as in-service chooches aren't exactly maintenance-free ;-)
Seriously, eight locomotives rotating in and out of service (should we ever get there) would more than cover our traffic needs. D&S can handle four trains a day by keeping six locos in the pool. Trains would be going up Cumbres like streetcars to require ten.
Not that trains going up Cumbres like streetcars would be a bad thing . . .
JAC