XI. Firemen.

A. This agreement also covers firemen. Pre-October 31, 1985 firemen will only have seniority in the Denver Hub and if unable to work an engineer's assignment or a mandatory firemen's/hostler position they shall be permitted to hold a fireman's position first in their prior rights zone and second, using their dovetail seniority.

B. Post October 31, 1985 firemen shall continue to be restricted to mandatory assignments and if unable to hold an engine service position will be required to exercise their train service seniority in the Hub.