Engineers are inspecting subway trains，Subway maintenance workshop，There are 5 tracks full of subway cars.。The engineer is a 28-year-old Asian male，Wearing blue overalls，Wrench in hand，A happy smile on his face。

ng_deepnegative_v1_75t,deformed, (deformed hands:1.5), missing limbs,amputated,pants,shorts,cat ears,bad anatomy,disfigured, poorly drawn face, mutation, mutated,ugly, disgusting, blurry, watermark, watermarked, oversaturated, obese, doubled face,b&w, black and white, sepia, frekles, no masks,duplicate image, blur, paintings, sketches, (worst quality:2), (low quality:2), (normal quality:2), lowres, normal quality, monochrome, grayscale, bad anatomy,(fat:1.2),facing away, looking away,tilted head,lowres,bad anatomy,bad hands, text, error, missing fingers,extra digit, fewer digits, cropped, worstquality, low quality, normal quality,jpegartifacts,signature, watermark, username,blurry,bad feet,cropped,worst quality,low quality,normal quality,jpeg artifacts,signature,watermark,