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东方红〈21〉型内燃机车,是由四方机车车辆工厂自1978年开始陆续为昆明局米轨铁路生产制造的。米轨铁路系山区铁路,线路标准低,曲线多且半径小,R=100～200米的曲线占曲线总数的70%左右。东方红〈21〉型内燃机车自投入运用以来,轮缘磨耗相当严重,特别是在雨季,机车一、三位动轮轮缘磨耗更为严重,新箍轮缘走行2万8千余公里便磨耗到限。据1982年三季度统计的平均数字,堆焊后的轮缘走行不足1万公里就又磨耗到限。针对这一问题,几年来我局曾采取过诸如曲线
Dongfanghong diesel locomotive <21> is manufactured by Sifang Locomotive & Rolling Stock Works from 1978 to Kunming Bureau Metrology Railway. Railroad track mountain railway, the line standard low, many curves and small radius, R = 100 ~ 200 meters of the curve accounted for about 70% of the total curve. Since the Dongfanghong diesel locomotive was put into operation, the rim wear is quite serious. Especially in the rainy season, the first and third locomotive wheels wear more seriously. The new rim rims wear more than 28,000 kilometers To limit. According to the statistics of the third quarter of 1982, the average number of running rims after surfacing is less than 10,000 km and the wear limit is reached again. In response to this problem, the bureau has taken such curves in recent years