In regards to the scope and size and time of a project - rebuilding a line from the ground up - i.e. MOM, or Cutoff or whatever would be much easier and quicker, IMO, when starting from scratch. Why?
Because you aren't having to work around train schedules - and when work is done for the day, it has to be left so trains can operate over the track and normal railroad function. This might include a lot of work which would ultimately be undone the next day when they start working again. All that takes a lot of time and money.
Look at the Whitehouse siding for example. that was graded, and the new track installed and cut in (not the signals, but the track) and the main replaced as well, in just a few short weeks!!! How? Because they had all day to work on the line inbetween runs, and all weekend. There is also very little freight up that way to interfere with as well. The PVL is different - while the passenger train schedules do allow large down times, there is still a significant amont of freight, which has to be worked around.
On the RR, "believe nothing you hear and only half of what you see"
John, aka "JTGSHU" passed away on August 26, 2013. We honor his memory and his devotion to railroading at railroad.net.