You'll get the dynamite? In your dreams... They've really tightened up on all that stuff. Blasting caps and other initiators, Detcord and fuses, "high purity nitrate compounds"

and other "system components" are darned hard to get - even with all the proper permits and licenses.
You might be able to get away with blasting the trench open in a rural or industrial area with enough blasting mats (basically a huge rug woven out of 1" or larger steel cable) and tire mats to stop the flying rock, but no blasting when you're 50' or 100' away from occupied homes...
No, if they hit rock it'll have to be dealt with the old fashioned way - some sort of a breaker hammer. The hydraulic ones that go on the boom arm of an excavator would be optimal.
The current ROW might not be optimal, but it's there and it's been used for trains continuously for 100+ years - the NIMBY's can complain about the "added noise", but they won't get any traction.
If you try a "new" route reusing an old rail/trolley ROW that would work better for current commute patterns, or blaze a brand new trail across unused land, the NIMBYs will be out in force fighting it on general principles. It might have been a Red Car or LaRY Yellow Line tracks, or an old freight line that was abandoned in the 1930's, 40's, 50's... But that was then, now it's going to be touted by the NIMBYs as "a pristine greenbelt that should be left as a nature preserve" or other such garbage.
You might be able to eventually re-route the line, but if there's any even semi-credible resistance to the "new" route it's going to add several years and several millions in costs to get around the protesters and get it done.
--<< Bruce >>--
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