aint nooo way you'd get me in the cab of one of those trains while it was running! Biggest damn pipe bomb there is! Even if it is ONLY steam!
That's what I was thinking when I was standing next to them. You could hear all the noise the boilers were making, along with the steam noises in the piping and valves. And, of course, both of them had little leaks here and there as well as pressure reliefs popping off now and then. The roadbed under the Jupiter was practically soaked!
According to the National Park Service, the only differences between the new locomotives and the originals are that the steam cylinders are one-piece castings, instead of the three pieces that were bolted together, the brakes are modern Westinghouse models instead of hand brakes and the boilers are steel instead of (gasp) cast iron.