A buffer stop, bumper, bumping post, bumper block or stopblock (US), is a device to prevent railway vehicles from going past the end of a physical section of track.
The design of the buffer stop is dependent, in part, on the kind of couplings that the railway uses, since the coupling gear is the first part of the vehicle that the buffer stop touches. The term "buffer stop" is of British origin, since railways in Great Britain principally use buffer-and-screw couplings between vehicles.
Several different types of buffer stop have been developed. They differ depending on the type of coupler used and on the intended application.
If there is extra room behind the bumper block, there is usually a sand or ballast drag that is designed to further retard a runaway train. One such accident occurred when a Northern City Line train powered past the bumper block at Moorgate station in 1975 on the London Underground system.
Largely because of its mass, a train transfers an enormous amount of kinetic energy in a collision with a buffer stop. Rigid buffers can safely cope only with very low-speed impacts. (i.e., nearly stationary). To improve stopping performance, a way of dissipating this energy is needed, through compression or friction. Following a buffer stop accident at Frankfurt am Main in 1902, the Rawie company developed a large range of energy-absorbing buffer stops. Similar hydraulic buffer stops were developed by Ransomes & Rapier in the UK.[ citation needed ]
Wheel stops or car stops are used to stop small numbers of light vehicles at the end of level storage tracks or to chock individual railroad cars on shallow grades. [2] [3] [4] [5] [6]
The Amagasaki derailment occurred in Amagasaki, Hyōgo Prefecture, Japan, on 25 April 2005 at 09:19 local time, just after the local rush hour. It occurred when a seven-car commuter train came off the tracks on West Japan Railway Company's Fukuchiyama Line in just before Amagasaki on its way for Dōshisha-mae via the JR Tōzai Line and the Gakkentoshi Line, and the front two cars rammed into an apartment building. The first car slid into the first-floor parking garage and as a result took days to remove, while the second slammed into the corner of the building, being crushed into an L-shaped against it by the weight of the remaining cars. Of the roughly 700 passengers on board at the time of the crash, 106 passengers, in addition to the driver, were killed and 562 others injured. Most survivors and witnesses claimed that the train appeared to have been travelling too fast. The incident was Japan's most serious since the 1963 Tsurumi rail accident.
A derail or derailer is a device used to prevent fouling of a rail track by unauthorized movements of trains or unattended rolling stock. The device works by derailing the equipment as it rolls over or through it.
In a railway accident, telescoping occurs when the underframe of one vehicle overrides that of another, and smashes through the second vehicle's body. The term is derived from the resulting appearance of the two vehicle bodies: the body of one vehicle may appear to be slid inside the other like the tubes of a collapsible telescope – the body sides, roof and underframe of the latter vehicle being forced apart from each other.
There have been a number of train accidents on the railway network of Victoria, Australia. Some of these are listed below.
The 2015 Uttar Pradesh train accident occurred on 20 March 2015. The Dehradun Varanasi Janata Express derailed near Bachhrawan in Raebareli, Uttar Pradesh, northern India, resulting in at least fifty-eight deaths and 150 people being injured. The accident was attributed to brake failure.
