while cascading the Siemens diesel locomotives to other parts of the network.
While VIA could certainly use some of the Chargers elsewhere on the network, according to Wikipedia, VIA is buying the
VIA is buying the SCB-40 variant for intercity rail service not the ALC-42 variant for long haul rail service (and thus has a larger diesel fuel tank). I am not sure how easy it would be to convert an SCB-40 to an ALC-42, but the smaller tank could make it harder to use on long distance routes.
North America’s Class I railroads are starting to run out of excuses why electrification would undermine their operational efficiency:
I think you are missing the point. The railways have been gradually increasing the clearance on their ROWs over the years. Since most of the ROW has blue sky overhead, they only need to fix the specific places where the clearance doesn't meet their new desired specification (tunnels, underpasses, sheds, etc). With a catenary overhead, they would need to raise it along the entire line, not just those few limiting places. Maybe they have reached the maximum clearance they will ever want, but maybe not. We don't know what the future holds. When the railways were first built, they didn't know that double stacks and auto racks would become a thing. This is yet another reason why having separate freight and passenger ROWs along the corridor is a good thing.
Interestingly,
GE and BNSF have been working together to produce a battery-powered locomotive that will work in conjunction with a diesel-electric locomotive. I gather the two locomotives share power back and forth, with the diesel-electric locomotive giving power (either from the diesel generator or the wheels) to charge the battery when there is extra power available, and the battery locomotive can give extra power to the diesel-electric locomotive when accelerating or climbing a hill. They claim that adding one battery-powered locomotive to a consist can result in up to 15% fuel savings. If the railways switched to hydrogen, this locomotive would still be useful (if not even more useful) for balancing out the power requirements (fuel cells aren't as good as batteries with huge surges in power demand).
There is no reason why a passenger version of this locomotive couldn't be built for long distance passenger trains (which typically have multiple locomotives anyway). Obviously VIA wouldn't be have enough buying power to influence this, but if Amtrak ordered some, VIA could piggyback on the order.