Almost certainly would need to have recharging facility in Danbury, as unlikely that could do a round trip from the main line at Norwalk. The other factor to consider is that the line in single tracked, so expanded service would require adding track so that trains could pass. The battery/diesel engines proposed were designed to use the battery only from GCT to the end of the Park Avenue tunnel (about 3 miles).Even if the catenary had been retained, chances are it would need renewing and upgrading to 60 Hz much as the main line was, so we might still be having this discussion.
Could a battery electric have enough power to handle that long a run with the grades mentioned? We haven't had much experience with battery electrics yet.
A quad-mode (3rd rail, overhead cat, battery, and diesel) engine would be quite a bit too heavy for the Park Avenue viaduct.Whatever MNRR finally buys will of course be the ideal equipment to purchase for the Danbury line. IMO the Amtrak proposed ALC - power car may the best set up. That solves the Park Avenue weight problems. However, for Danbury line that would mean both a 3rd rail and overhead CAT setup. Since the MNRR west side connection and east side connection implementation dates are somewhat unknown how a first order will be specified is still to be determined.
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