This situation gives rise to two separate causes of action under two different statutes:
As the death arose from a motor vehicle (bus) accident, a claim for compensation can be made against the owner/insurer of the bus under the Motor Vehicles Act. This is a claim based on tort law.
As the death occurred during the course of employment, a claim can be made against the employer (Railway) under the Employees' Compensation Act, 1923. This is a claim based on social security legislation.
The claimant has the right to file a claim under both statutes. However, a legal principle known as the 'doctrine of election of remedies' applies, which is also reflected in the statutes. The claimant cannot receive compensation under both acts for the same accident. They must choose to pursue their remedy under either the Motor Vehicles Act or the Employees' Compensation Act.