Byron Hill

I have three questions about freights on Byron Hill.
(1) Did they use helpers on the front end or pushers on the rear?
(2) Where was the extra engine put on and taken off?
(3) In 1930's and 1940's, what type of loco was used for this service?

In the diesel era trains frequently stalled on the hill. Following engines would cut off
their train, pull up behind(stalled train) and shove them up to and sometimes west of Cedar St(CP???).
They would head east and reconnect to their train to discover,occasionally,that they
would struggle to get up the same grade.
When the passing siding/running track was used due to heavy traffic ,many times, waiting
trains had their units borrowed to make a rescue run and pull the stalled train up.
One Saturday night in the 60's we watched this process take place 3 times from 7pm-2am.
That night there were 3 trains packed into the running track and the yard lead.

The steam era pushers started at South Byron. There was an engine shed located near the
depot and the row held 4 main tracks,and 2 passing tracks that passed thru this shed.

Thanks for the info. Do you have any idea what the steam power was at South Byron - 4-8-2's or 2-8-2's (or something else?)
Also in the steam days, were the South Byron engines helpers on the front end or pushers on the rear? Ted