Railway Maths Previous Years S is a free Android application developed by The Knowledge Express. It is a comprehensive study companion for railway exams, including RRB NTPC, RRC Group-D, RRB ALP & Technicians, RRB JE CBT-1, and RRB RPF SI. The app contains solved questions from previous years' exams, including RRB NTPC Previous Years Maths Solved Questions, RRB Group-D 2018 Maths Solved Questions, RRB ALP & Technicians 2018 Maths Solved Questions, RRB JE CBTMaths Solved Questions, and RRB RPF SI Maths 2018 Solved Questions.

In addition to the previous years' solved papers, Railway Maths Previous Years S also features free test series, daily current affairs articles, and daily, monthly, and yearly current affairs. The app has chapter-wise previous years MCQ tests, exam-wise and chapter-wise PDF notes, exam-wise free test series, subjects-wise previous years solved questions, and day-night mode. It also provides important job updates and exams notifications, exam target questions, and a user-friendly interface in both Hindi and English.