Sure! Here's a comparison of the means of transport using the adjectives provided:

A: Which is faster, a train or a plane?
B: A plane is faster than a train.
A: And which is the fastest?
B: A plane is the fastest of all.

A: Which is more expensive, a plane or a train?
B: A plane is more expensive than a train.
A: And which is the most expensive?
B: A plane is the most expensive of all.

A: Which means of transport is safer, a train or a bus?
B: A train is safer than a bus.
A: And which is the safest?
B: A train is the safest of all.

A: Which is more relaxing, a train or a plane?
B: A train is more relaxing than a plane.
A: And which is the most relaxing?
B: A train is the most relaxing of all.

A: Which is cheaper, a bus or a train?
B: A bus is cheaper than a train.
A: And which is the cheapest?
B: A bus is the cheapest of all.

Feel free to modify any phrases or ask for more comparisons!