The assimilation between a crane driver and a train driver is they are both semi skilled jobs, and both on high wages for the skill level, the wage link I posted was 2 years old and an ABS one at that, according to Jim Chrystomou the Assistant Secretary of the RBTU the base wage of the train driver is $90,000, so with overtime, and the inclusion of their super, could very easily go over the $100,000.
And the overtime is one of the things the unions (train drivers) are wanting to preserve in their conditions, Metro want to employ more drivers to make up for the shortage, I thought the union movement was about one for all and all for one, obviously not.
The figure of $140,000 is on the upper end of the scale of a wage, but I doubt the figure was just plucked out of the air, their will be some earning that I am sure.