Because the roundhouse now has an extra set of passenger coaches available for use with the absence of the "Lilly Belle", locomotives will typically swap their consist instead of waiting for the solid side panels to be put back on.
Locomotives will typically swap their consist instead of. Locomotives were waiting for the solid side panels. This was to be put back on. The roundhouse now has an extra set of passenger coaches available for use with the absence of the "Lilly Belle".