While Halethorpe tower stopped being a manned location in 1985, it continued to be a CTC control Point until about 2006 when the St. Denis control point was established. The power switches from Halethorpe were moved to Connellsville once the St. Denis control point became operational.
Trains are crossed over at Halethorpe and/or St. Denis in accordance with the needs for the operation of Baltimore Terminal. The establishment of the St. Denis control point lengthened the distance between the Lansdowne control point and allowed for the holding of larger trains on the siding between Lansdowne and St. Denis. Trains get held for a number of reasons. Crews, space at destination and a number of other reasons. Consol Coal trains are normally held on the siding until space is available to the Consol facility on the NS in the Canton area of the city.
Since Mt.Clare Yard is no longer a classification yard there is little traffic the comes out of Mt. Clare on what were once #3 and #4 Main Tracks. Coal/empty trains to Curtis Bay use #3 track from Curtis Bay Jct. to St. Denis through West Baltimore and Lansdowne.
At St. Denis - East and West bound trains on any track can be routed to any track in their direction of movement - Eastbound trains on OML, #1 or #2 tracks can be routed to #1, #2, #3 tracks or the Halethorpe Siding; by the same token trains on any of those tracks can be routed Westbound to #1, #2 or the OML.
Never too old to have a happy childhood!