the company was formed in 1960, while the current name speno international sa was adopted in 1965. speno has always developed its own equipment. in 1980 it introduced the first 'road rail' grinding machines for urban railways. in 1985 it introduced the first inspection train that could find any flaws in the tracks in real time by simply having .
there are many rail profiles, often specific to individual railroads. rails must be periodically scanned electronically, the data inspected and analysed, then re-profiled with rail grinding machines to maintain the safe and proper rail profile. rails that cannot be brought back to the proper rail profile are condemned and replaced. rail squeal
dimensional tolerance is related to, but different from fit in mechanical engineering, which is a designed-in clearance or interference between two parts. tolerances are assigned to parts for manufacturing purposes, as boundaries for acceptable build. no machine can hold dimensions precisely to the nominal value, so there must be acceptable .
in general a merge into 'track rail transport ' of a fixed article i would support, there's a lot of material duplicated. secondly rail profile i would recommend merging into a new article 'rails rail transport ' that needs creating - note we don't actually have an article on rails themselves - eg the evolution of lengths etc.
the southeastern pennsylvania transportation authority septa is a regional public transportation authority that operates bus, rapid transit, commuter rail, light rail, and electric trolleybus services for nearly 4 million people in five counties in and around philadelphia, pennsylvania.it also manages projects that maintain, replace and expand its infrastructure, facilities and vehicles.
the joining operation is performed by an aluminothermic welding machine which is equipped with a rail saw, a weld shear and a grinder. when the thermite welding process is complete, the weld is ground to the profile of the rail, resulting in a seamless join between rail sections.
loram maintenance of way, inc. north american reporting mark: lmix is a railroad maintenance equipment and services provider. loram provides rail track maintenance services to freight, passenger, and transit railroads worldwide, as well as sells and leases equipment which performs these functions.