This is probably a bit unusual. My wife and I are off on a cruise, and the first port of call is Greenock. We are planning to head into Glasgow by train from Greenock. I've looked up times and fares - it's just a question of how reliable ScotRail generally are on a Sunday, as obviously we need to be back on the ship in good time before it heads off to Iceland. We do have options of coaches arranged by the Cruise Line, but they are triple the price of the train fare.