The treadle bar is provided A. in the middle of the track a little in front of the toes of the tongue rail B. near and parallel to inner side of one of the rails C. at right angle to the rail D. near and parallel to inner side of both the rails

The correct answer is: B. near and parallel to inner side of one of the rails.

The treadle bar is a metal bar that is attached to the side of a railway track. It is used to keep the track in alignment and to prevent it from derailing. The treadle bar is located near and parallel to the inner side of one of the rails. This helps to keep the track in alignment by providing a surface for the wheels of the train to ride on. It also helps to prevent the track from derailing by providing a barrier that prevents the wheels from going off the track.

The other options are incorrect because they do not describe the correct location of the treadle bar. Option A is incorrect because the treadle bar is not located in the middle of the track. Option C is incorrect because the treadle bar is not located at right angles to the rail. Option D is incorrect because the treadle bar is not located near and parallel to the inner side of both the rails.