This used to originally run b/w LKO and MTJ as an overnight train before being extended to PNBE and KOTA on both sides. When I travelled last on it, ticket availability was quite easy to get except for when it was holiday time in Kota ie. student rush from there towards UP/Bihar at which point it became basically full which students. IIRC, it became so dense once that as soon as the reservation period opened, it entered into REGRET before the day could end, such was the rush.