double crossover

(redirected from Railroad switch)
Also found in: Encyclopedia, Wikipedia.

double crossover

two separate CROSSING-OVER events occurring between CHROMATIDS. In a TEST CROSS involving three genes, progeny that have carried out this process can be identified and usually from the least frequent type of offspring.
References in periodicals archive ?
The first new railroad switch was mounted on September 9, 2016.
The overhaul of six station tracks and ten railroad switches has begun at Azerbaijan's Astara railway station,Trendreports referring to Azerbaijan Railways CJSC.
railroad switches p65 1/11 project 2768 complete with all necessary fasteners for assembly with rubber pads for assembly of the spike block, without electric drive headset, with four sets of six-composite (insulating) linings 188 sets, 6,023,520 usd
A total of BGN 7 M will go to the renewal of railway tracks and a total of BGN 900 000 will be spent on the replacement and repair of railroad switches.
(SeeNews) - Mar 24, 2014 - Austrian steel group Voestalpine (WBAG:VOE) and Austrian Federal Railways (OeBB) will set up a joint venture (JV) for the maintenance of railroad switches, economic magazine Trend reported.
In some instances, the railroad switched from four-axle to more powerful six-axle locomotives to accommodate CEMEX's needs.
1 with a length of 6214 m, 2nd and 3 your tracks in the station batanovtsi lengths of 649 and 572 meters, railroad switches ?
This week, the Oregon Transportation Commission scheduled a vote to consider rescinding the grant altogether, which would mean RailAmerica blew the $4 million in construction costs it already spent on the Winchester switchyard and there'd be no solution to the congestion problems in downtown Roseburg, which happen when the railroad switches railcars in its yard.
19, wiping out 1,500 feet of track in one place and another 150 feet farther down the mountain where the railroad switches back on itself.
A special fabrication yard has been built at the Sangachal production base, where the assemblage of lower structures of railroad switches and new reinforced concrete slabs is carried out.
19 on Coyote Mountain, about eight miles southeast of Oakridge, wiping out 1,500 feet of track in one spot and another 150 feet below that where the railroad switches back down the steep slope.
"So far, 150 new railroad switches have been installed," the message said.
Full browser ?