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37signals. Known for. Ruby on Rails. Website. dhh .dk. David Heinemeier Hansson is a Danish programmer and racing driver. As a programmer, he is the creator of Ruby on Rails, a software framework for web development. [ 1] He is also a partner and chief technology officer at the web-based software development firm 37signals.
Montana Rail Link ( reporting mark MRL) (now operated by BNSF as the MRL Subdivision) was a privately held Class II railroad in the United States. It operated on trackage originally built by the Northern Pacific Railway and leased from its successor BNSF Railway. MRL was a unit of The Washington Companies and was headquartered in Missoula ...
Ruby on Rails (simplified as Rails) is a server-side web application framework written in Ruby under the MIT License. Rails is a model–view–controller (MVC) framework, providing default structures for a database, a web service, and web pages. It encourages and facilitates the use of web standards such as JSON or XML for data transfer and ...
A stair lift is a mechanical device for lifting people, typically those with disabilities, up and down stairs. [ 1] For sufficiently wide stairs, a rail is mounted to the treads of the stairs. A chair or lifting platform is attached to the rail. A person gets onto the chair or platform and is lifted up or down the stairs by the chair which ...
The light rail in Tunis, Tunisia, was the first light rail system in Africa. Light rail (or light rail transit, abbreviated to LRT) is a form of passenger urban rail transit using rolling stock derived from tram technology [ 1] while also having some features from heavy rapid transit .
The Link light rail system serves the Seattle metropolitan area in the U.S. state of Washington and is operated by Sound Transit. It consists of 39 stations on three unconnected light rail lines in King and Pierce counties: the 1 Line from Seattle to SeaTac; the 2 Line from Bellevue to Redmond; and the T Line in Tacoma. [ 1][ 2] The first Link ...
The Mobile Remote Servicer Base System (MBS) is a base platform for the robotic arms. It was added to the station during STS-111 in June 2002. The platform rests atop the Mobile Transporter [6] (installed on STS-110, designed by Northrop Grumman in Carpinteria, CA), which allows it to glide 108 metres down rails on the station's main truss. [7]
This is a list of railway lines in Great Britain that are currently in operation, split by country and region . There are a limited number of main inter-regional lines, with all but one entering Greater London. [1] The line from London to the Channel Tunnel is the only line designated ' high speed ', although the other main routes also operate ...