钢轨
1. The new stainless steel trains have started trial running on a spare section of the city's rail route.
2. New stainless steel cars have started running on a trial basis on an unused section of the city's rail route.
3. Worries surrounded the reinforced steel bar of the guard rail, which had been slated for a quality test.
4. Many migrant workers have not been paid for six months, while rail construction companies also owe big sums to cement and steel suppliers.
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5. Many migrant workers had not been paid for six months while rail construction companies owed big sums to cement and steel suppliers.
6. steel rail
6. The rail construction companies also owe big sums of money to cement and steel suppliers, he added.