Anyone know what SPCSL is?

I was over on UPRR.com and found the common name for lines.

Number 11 from Chicago to St. Louis could SPCSL be something like Southern Pacific Chicago to St. Louis Line?

ok reading up on the history found it

1989
UP's Harriman Dispatching Center opens in Omaha, centralizing all train dispatching in one location. UP purchases 25% of Chicago & North Western stock, which is held in a voting trust. SP gains access to Chicago with the purchase of the St. Louis to Chicago line from the defunct Chicago, Missouri & Western. SP sets up a SPCSL (SP-Chicago-St. Louis) subsidiary.