I came across this rule in a time table from Conrail that just states that only GP38's can't be used on this one secondary in my area but allows all outhers to be used. What kind of track condtions would ban the use of only GP38 from being used on a strech of Railroad but not ban the use of everyouther locomotives? Any ideas or reasons?
What area are you referring to?
I believe CR had a fleet of locos with notches cut out of the plows so they could clear the 3rd rail in Metro North and LIRR territory.
IIRC they had an orange or yellow line painted on the plow to show they were different
Also, in area where there are cab signals, the lead loco needs to have cab signals equipment installed on it adn operational. If its in the NJ area, CR frequently had GP38's equipped with cab signals.