Why do some trains click as they pass over the tracks?

On old sections of track, the rails were made in sixty-feet lengths, thus there is a rail joint every 60 feet and that is what causes the clicks as the wheels pass over them. Thus on a normal train consisting of bogie carriages (two pairs of wheels at each end) you will hear a double click as the first pair pass over the joints, thereafter you will get the "clickety-click" as the rear end wheels of the first carriage are quickly followed by the leading pair on the second carriage. This continues until the very last carriage where the very last pair of wheels will just create one double click.

On more modern tracks, they are laid using the "continuous welded rail" (CWL) principle where all lengths of rail are welded together on site (even if they arrive in much longer lengths than the old 60 feet - using specially built rail waggons which carry continuously welded lengths which can be unloaded on site) and they ten have to build-n "expansion" joints which is where two adjoining lengths of rail are NOT butt-jointed and welded but are cut at a very narrow angle (like two long, thin wedges) which are then greased and clamped together. This allows contraction and expansion of the long lengths when the temperature fluctuates although these joints are usually adjustable to allow for greater expansion in really hot weather. Needless to say, when running on "CWR", there is nothing to cause the 'clickety click' so the ride is comparatively silent - and generally smoother.

Back in the old days, rails came in 39 foot sections, and where they were bolted together there was a tiny gap that the wheels would make that clickingsound.

Now most (not all) rails come in 1/4 mile sections and these are welded together when they are installed so there is no place where they are bolted together, so no clicks.

Look at the rail where you see the clociking sound coming from and you will see those rail joints, each wheel that passes over them produces a click, or clack as some prefer to call them.

It doesn't depend on the type of train whether or not you hear the clicking sounds, but on the type of track.

Modern track is mostly continuously welded so you don't hear any clicks. Older track is jointed with gaps left at the joints to allow for metal expansion in hot weather. (Continuous rails have the expansion built-in.)

The clicking sounds are produced as the wheels pass over the joints in older track. You hear double clicks because wheels under passenger coaches are arranged in sets of four called 'bogies', so there's one click for each pair of wheels.

The clicking sound is the wheels passing over joints in the rails. If there at two axles close together you'll get the clicks in rapid succession as the wheels pass over the joint one after the other in rapid sequence.

If there are multiple joints, such as at points, crossovers and the like you'll hear a succession of clattering. If the rail where are you is continuously welded and has no joints all you'll hear is the whoosh of the wheels running smoothly.

The change in clicks is how far apart the joints are. when you look at the tracks the left rail and right rail for safety will join at different points along the line.if the left and right joints are just a few meters apart you hear one click if the left and right joints are far apart you hear two clicks. They try to make the joints half way in between each side.

All trains make a clicking sound when they pass over joins in the rails. If you don't hear the sound when a train goes past you, it means there is no join in your vicinity.

It's their wheels passing over the joints in the tracks!

Unless it's continuous weld which produces a whizzing sound. This track still has expansion allowances but not in the old way by just having wide joints.

God, I know loads about all sorts of things, don't I?

A single click is produced by the last bogie of the end carriage.

(See what I mean?)

Has to do with the tracks. Double click is like the lid of a jar pop when you push it down, pop when you release. If the tracks bend/give way it'll make noise. Or if there is a seem on the track. Trains have double wheels, two wheels = two clicks.

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It's the gaps in the track. Has to be gaps to allow the track to expand and retract in hot or cold weather.