Class 158 Express Sprinter

• ScotRail's fleet (40 two-car units, Wikipedia, checked against ORR's diesel vehicle total)
• GWR's fleet (13 two-car and 5 three-car units, Wikipedia)
• The drawing: measured from livery artwork rather than an engineering drawing; heights are the artwork's (roof drawn 12 ft 5 in (3.78 m) against the published 12 ft 3 in (3.73 m))
• Bogie centres: the sources disagree; the cab-end bogie is drawn 9 ft 10 in (3.0 m) from the cab corner (±0.25 m), the inner one ±0.2 m
• Wheels drawn 2 ft 6 in (770 mm) across, from a laser scan of worn wheels; the new-wheel diameter wasn't found
• Door-leaf height ±0.1 m; the crew door's window narrowed to 2 ft 2 in (650 mm) from the laser scan and photographs
• The silver line's height and the yellow front's edge and fairing are placed from photographs (about ±60 mm)
• Colours: sampled from photographs; no paint reference has been published
• The drawing's underframe: laid out from a Commons diagram that isn't to scale (scaled by the bogie centres, good to about 100 mm along the car and 50 mm in depth); the boxes are simplified, the mid-grey ones are the diagram's pale ones (the long low one is probably the silencer), and both cars are drawn alike, as the diagram draws them
• The bogies: drawn in the shared Sprinter style, the Class 150's BP38/BT38 as traced from its 1:30 drawing, scaled to this drawing's 8 ft 6 in (2,600 mm) wheelbase and 2 ft 6 in (770 mm) wheels, its plate up to the skirt band at 3 ft 0 in (914 mm); the 158's own P4-4/T4-4 (Wikipedia) has the same outside frame and air spring but coil-spring primaries over the axleboxes (Commons photographs of 158959 and 158798), which the style doesn't draw: close, not exact
• Car length 74 ft 1 in (22.57 m): Angel Trains' Class 158 page, which gave it, has been taken down (404 in October 2026), and Porterbrook's Class 159/0 sheet gives 72 ft 8 in (22.16 m) a car for the same body; which basis each figure is on isn't known
• ScotRail Saltire: the sheet is a schematic (its doors are 16% narrower than the measured body's), so its arrows, dot fields, orange line and yellow front are placed against the body's doors, windows and ends, to within about 100 mm
• ScotRail Saltire: the far car is drawn as the near car turned round; the sheet's first car shows its arrows dark as read here, so its second car's white arrows are traced
• ScotRail Saltire: the arrows and dot fields are drawn as dots, the vignettes at the Class 156 sheet's spacing and sizes (in this sheet's own units its dots are the same within 5%, but its scale is uncertain, since its doors are drawn narrow); the yellow is the sheet's own fill (no paint reference found for it)
• ScotRail Saltire: the sheet dates from ScotRail's 2010 guidelines, as the placed page says; later changes aren't shown
• ScotRail Saltire: the cab-end arrow (salt2, 11 October 2026) is read from one close side-on photograph of 158722 (2026), rectified on the cab window at one scale both ways (the drawn window is about 14% shorter than photographed): one lattice, 114 mm along the rows and 107 mm between them, each row 18 mm to the left of the one above as seen; the far car, the same car type drawn turned round, has that lean reversed about the arrow's point, so its rows too step left going down as seen (SA32, 11 October 2026)
• EMR purple: colours: the Class 170's, sampled from photographs; no paint references have been published, and the fairing grey is an estimate
• EMR purple: the yellow front's foot (4 ft 11 in (1,500 mm), about ±50) and the orange line's depth (25 mm, as the Class 170's) are placed from photographs
• EMR purple: the yellow's edge over the cab dome, and the orange line round it, are placed from photographs (about ±50 mm)
• EMR purple: the swoosh lines are measured on one photograph of 158866's near side (heights about ±50 mm, the bends' ends about ±250 mm), with 158852 agreeing near door 1; their exact curves are simplified
• EMR purple: the door-step edges' depth (25 mm) is placed from photographs, and drawn just under the body's outline (1,045-1,070) rather than at the bodyside foot, which the outline covers
• EMR purple: whether every EMR 158 carries this livery wasn't checked: the refurbishment that repaints them was under way in September 2026, and Commons' 2019 diagram shows the white livery that came before
• EMR Regional white (2019): which units carried the white livery, and until when, wasn't found: 158774 (December 2019) and one unidentified unit (February 2020) are photographed in it; most EMR 158s kept the Stagecoach livery with EMR lettering, and by 2024-26 units were in EMR's interim livery (158774 with plum doors by September 2026)
• EMR Regional white (2019): colours: the orange is sampled on one photograph of 158774 in low sun (no paint reference found); the white is the site's drawn white; the glass is the purple entry's dark grey; the roof grey and yellow are the record's own (from GWR-era photographs)
• EMR Regional white (2019): the orange line's depth (25 mm) and its run round the cab dome, and the door-step edges, are placed as on the purple units' photographs; the 2019-20 photographs agree on the line over the dome but are too small to confirm the step edges, which the diagram shows
• EMR Regional white (2019): the yellow's side edge is GWR's drawn one (282 mm from the gangway face), which 158774 matches by eye
• Transport for Wales: colours: the grey is TfW's paint reference (NCS S 3000-N, the key of its Class 150 livery drawing), checked against a Class 197 and a 150 in the same frames and a white sign; the red, band and roof sampled from two photographs in different light and averaged; the yellow is the record's own
• Transport for Wales: the band's ends (about 250 mm either way) and heights (about 50 mm) are measured on one rectified photograph; the red line is drawn at the cantrail as on the record's other liveries, about 40 mm below where 158829 shows it
• Transport for Wales: TfW's 158s are being replaced by Class 197s (Commons calls 4 March 2026 'almost certainly the last days' on the Cambrian lines); they were still in service in North Wales in June 2026
• Northern: the blue's edge is placed from three photographs, none square-on (about 250 mm); its curve is simplified
• Northern: colours: the Class 323's for the same livery, checked by eye against sampled values; no paint references found
• The years of the former liveries come from Wikipedia's class article and the other sources listed, and haven't been checked against a second source.

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