Under what condition can a train with a horn failure proceed without further actions at a crossing?

A train can proceed without further actions at a crossing in the event of a horn failure if certain conditions are met. In this scenario, if no traffic is present at the crossing, the train can safely move forward, as the absence of traffic reduces the risk of a collision. Additionally, if the gates are fully lowered, that indicates to drivers and pedestrians that it is unsafe to cross, allowing the train to move through without needing to sound the horn. Furthermore, the presence of a qualified employee to assist ensures that safety protocols are adhered to, and the employee can provide signals or guidance to ensure that the crossing remains safe. All of these conditions contribute to the overall safety of train movement through a crossing during a horn failure, thereby allowing the train to proceed without further actions.