@Chris Harding i would love to stand at front of one these locos at full speed probably a big no no in OHS pov.
A 48 Class? They are not the fastest runners on the system, and not great riding at 100 kmh. The bigger locos are much more stable and comfortable. The 48 has all the comfort of a WWII submarine, but I admit that they are fun to ride.
Modern locos have comfort cabs, plush seats, air conditioning, hotplate, microwave, CD player, noise and vibration insulation, and a toilet. They don't have the raw feeling of early diesels, where the noise, grease and smell of the engines were part of the experience.
They are powerful, but they are controlled like a modern automatic car, and accelerate in a smooth effortless way. They cannot match the excitement of the surge of power from a big 38 Class steam loco when you cracked open the throttle on an express train. 38s could do wheelies -I'm serious.
The issue today is that should something happen, and the driver has a civilian in the cab, the consequences for him would be dire, and the operators could face massive damages claims from them and their family.
There was a time when State Rail would have you sign an indemnity, but lawyers today would find holes in the document and sue for millions; such is the state of things. It's why my society can't run tours through the disused tunnels under Sydney. Someone might trip over and sue Sydney Trains.
Gone are the days of friendly drivers happily letting a kid ride up front with them. It's just too risky if they're caught, so you have to think about their jobs and what would happen to them.