It sounds like you saw a load test taking place. During this test the main generator's output is routed to a resistor instead of the traction motors, allowing the unit to be 'put through its paces' while stationary. Most locomotives with dynamic braking can use their own DB grid as the resistor, some older units or those without DB have to be connected to a external resistor, which is sometimes made of DB grids salvaged from scrapped locomotives, as an example CN's Edmonton load tester is made of parts from two F-units.
It is normal for locomotives to be load tested after a repair has taken place (to make sure the fix worked), or in an attempt to diagnose a problem (some issues only show themselves when the engine is operating under heavy load).
Greetings from Alberta
-an Articulate Malcontent
SD70Dude,
Thanks for your insights. Very helpful.
Every time I read one of your responses, I think of my college roomate. He was from Toronto. We roomed together the entire time that we were at Penn State. He was a great friend.
If BNSF painted the engine it could have been done at Alliance, TX or Barstow, CA. Both of which are major repair facilities. If not it may have been at Relco at their Iowa shops.
Our community is FREE to join. To participate you must either login or register for an account.