Identify the correct statement(s) associated with providing super elevation on railway curves.

S1. Cant Excess : Occurs when the train travels around a curve at a speed higher than the equilibrium speed.

S2. Cant Deficiency : Difference between the actual cant provided and the theoretical cant required at low speeds.

S3. Maximum permissible speed: Highest speed permitted to a train on a curve taking into consideration the radius of Curvature, actual cant, cant deficiency, cant excess, and the length of transition.