The EGE
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The problem with that approach is that getting to Taunton is the vast majority of the difficulty. Historically, Boston-Taunton-South Coast service either used the Dighton and Somerset (either via Braintree or via Canton Junction), or the Mansfield-Taunton line.* Both of them are now abandoned, and portions of ROW in Mansfield and Randolph are redeveloped. That leaves you four (even slightly realistic) options to get to Taunton:
* Early Boston-Fall River service ran via Middleborough and didn't serve Taunton. That routing was down to a single daily round trip by the 1920s, and ended around 1931. The ROW between Middleborough and Myricks is now obliterated. The Phase 1 alignment via Middleborough and Cotley Junction is not a routing ever used before, as there was never a complete wye at Cotley.
- Go via Attleboro. Either you build a new 3-mile bypass (as proposed in the 1990s), or have a reverse move at the station. Either way, you have to deal with creating NEC congestion and the Taunton grade crossings. Rather indirect route.
- Go via Mansfield. The original ROW through downtown is redeveloped, so you'd have to build a new ROW along 140 and 495. Deals with NEC congestion (slightly less than Attleboro) and the Taunton grade crossings. Fairly direct route.
- Go via Canton Junction and Stoughton. Reactivate the ROW through three very rail-hostile towns, and deal with a lesser amount of NEC congestion. Flat and straight ROW - the most direct route.
- Go via Middleborough. Highly indirect route, Old Colony mainline bottleneck, requires a reverse move at Taunton to serve FR/NB, and hurts potential Cape Cod service. All active ROW, and can avoid most Taunton grade crossings depending on where you put your station.
* Early Boston-Fall River service ran via Middleborough and didn't serve Taunton. That routing was down to a single daily round trip by the 1920s, and ended around 1931. The ROW between Middleborough and Myricks is now obliterated. The Phase 1 alignment via Middleborough and Cotley Junction is not a routing ever used before, as there was never a complete wye at Cotley.