There are a variety of answers. Traffic could be one, or schedule changes. For trains, probably the latter reason.
One could buy a map of the train routes and on it there would be a time schedule for each of the trains. There are also schedules online that can be easily found.
Depends where in Wales you want to go... Trains can be taken from London to Cardiff in the South, or through Bangor and Holyhead in the North. You could also make an internal flight to Cardiff. Or drive, or take a bus.
Yes, you can see Orion's belt from Wales.
Like everything in the world, trains will, inevitably, grow old and need replacing. Old trains could be dangerous and pose health and safety issues.
There are many places on the web one could look to find a holiday cottage located in Wales. One looking for a holiday cottage in Wales could visit Quality Cottages, Wales-Holidays, or Welsh-Cottages.
yes but its not likely
trains could run longer
It could be very expensive
They could get to work on trains
HO scale trains were developed in roughly the year 1900. HO scale trains are the most popular scale trains in the entire World. The scale is roughly 1:87 which is quite different to some other model trains which could explain its popularity.
No. "I could have gone with you if I had known your schedule." Or "If I had known your schedule, I could have gone with you." Your verb tenses are incorrect in the original, and you need to use "if" to set up the condition.