Present technical development is rapid, appeared the vehicle of a lot of advantage, when we go out to travel, can oneself drive to be driven oneself swim, also can do motor-car, the train, plane, ship waits vehicle a moment, these give a tool offerring advantage for the mankind all the time, major now person most what often sit is the train and motor-car, price material benefit, rate is moderate, although aircraft of be not a patch on is so fast, but this can be the fastest vehicle that runs on land. The friends that had taken the train may discover, the rail of train travel does not grow grass on the road, it is clean really, a grass is done not have, the desert that you see connect drought can appear now and then the shadow of 9 small grass, seemed to be issued among this rail however cuss, no matter go how long, be stupefied is a grass did not grow, is this after all why? Railroad spoke backside " feline be bored with " . When building railroad, can have provided the roadbed glue of railroad first, method is pressed through chasing a layer to fill up earth to grind water, after shaping, be in above roadbed on the shop course platoon, spread on one next very the cobble of tight and sand still have wood, the stone action that goes on these shops can be very big, these cobble and sand are ballast, time is long there is earth to be able to be met inside ballast harden, want to undertake clear sieve. Roadbed often undertakes tamp even. Be versed in through the person namely or machinery takes ballast stuff in the earth of roadbed. These ballast use fixed rail and those wood, it is to use the high temperature that drops the train to arise in travel process on the other hand, still can alleviate the train is right the wallop of rail, prevent rail deflection to give track. And these ballast are met the growth of block up small grass, and everyday can worker of line of make one's rounds is in above rail patrol, once send,existing problem can be handled immediately. Workers of these line of make one's rounds should patrol everyday, no matter blow,rain to had not stopped, a day of at least takes the route of 20 kilometers, the shoe that wears bad can pile mountain, because want to let the train,be surely travel. And when line worker is patrolling, make one's rounds also can be among rail gush herbicide, such fireweed are more impossible above rail grow. Also not be all rail nevertheless the not long grass intermediate, those often have the train to pass the rail that look, everyday worker of line of make one's rounds patrols, gush medicine, nature won't grow grass, but those bedraggled rail that pass for long without train travel are safeguarded without the person give grass to come with respect to chairman. So everybody knows this backside now " feline be bored with " , what idea does everybody have to this thing?