I was told that it was impossible to do because even though we had the rolling stock, we did not have the ability to deal with a union that had the opportunity to charge double time, triple time and all kinds of things on a train that was going across the country for two or three days.
Only single time can be charged.
( z1 possible :ARG1 ( z2 charge :time ( z3 time :ARG1-of ( z4 single :mod ( z5 only ) ) ) ) )