This phrase comes from a Milton poem called Comus (1697):
Come, knit hands and beat the ground,
In a light fantastic round
To "trip" in this sense doesn't mean to stumble over something. It means to dance lightly and nimbly. This is a very old phrase, now usually used humorously, to mean dancing, especially ballroom dancing.
dance
The cast of Trip the Light Fantastic - 2010 includes: Courtney Ortiz as Principle Dancer
Trip the Light Fantastic - 2010 was released on: USA: 5 November 2010 (New Visions and Voices)
Trip the Light Fantastic - Sophie Ellis-Bextor album - was created on 2007-05-21.
The duration of Noel's Fantastic Trip is 1.2 hours.
Noel's Fantastic Trip was created on 1983-04-29.
Literally, it means "good trip," but it is best interpreted as "Have a good trip!"
My Fantastic Field Trip to the Planets - 2005 V is rated/received certificates of: USA:G
The phrase "good trip" comes from slang. The phrase "good trip" refers to getting high on hallucinogenics such as Acid or Mushrooms. A good trip happens when a bad trip doesn't. You can learn more information about this at the Urban Dictionary website.
trip
To curtail can mean to cut short, or cut off a part of something. For example, to curtail a trip would mean to cut short a trip. A synonym to curtail is to cut back.
The prepositional phrase is by train.