In focus: the step-wheel track, or the part named in the readoutTruss, tracks, step chain, drive and tension stations; near glass drawn clearA 30° escalator with a 6.0 m rise (12.0 m of incline) at 0.5 m/s, the usual speed (EN 115-1 allows up to 0.75 m/s at 30°). Steps are 1,000 mm wide on a 400 mm pitch, so each riser is 200 mm; EN 115-1 Annex H rates this step at this speed for 6,000 people an hour (9,000 in theory). Lifting 40 riders of 75 kg (3,000 kg, our assumption, drawn as 100 kg on each of the 30 incline steps) takes m·g·v·sin 30° = 7.4 kW; with an assumed 85% drive efficiency and 1.5 kW of no-load friction the motor gives about 10.2 kW. The 16-tooth step-chain sprockets turn at 14.0 rpm (assumed 1,460 rpm motor, 34.8:1 gearbox, 3:1 chain); the same shaft drives the handrail 1% faster than the steps (EN 115-1: 0 to +2%). Each step rides two pairs of wheels on separate tracks. The step-wheel track is the chain-wheel track shifted by the wheels' 26 cm spacing, so on the incline it runs 15 cm higher and at the landings it meets it: the tread stays level and the steps flatten into a floor. Transition radius 1 m and 0.8 m of flat travel at each comb are EN 115-1 minimums at this speed. Near truss panel, near balustrade glass and the landing floor plates are cut away or drawn clear. Bops Lab