seat rows), or S 319 UL (= 19 seat rows). The seats are reduced by comforter buildings or a certain star classification; The type designation is retained. Starting from the series 200, additions after the number indicated the equipment: current (series 400/500) are H for high-floor construction (no wheel arches in the passenger compartment), HD for high floor, HDH for an extra-high floor, DT for double-deck touring bus, MD for mid-height floor (a spinoff of the GT series), UL for interurban commuter buses and NF for low-floor buses. In the past, the Grand Tourisme (GT), HDS for double-deck, SL for city buses, and NR (low-floor Rational) were used for the first highway low-floor (200 series). Only a few types were given different designations, for example, the S 250 Special (a modified S 215 HD which was also offered as an entry-level model after the introduction of the 300 series) and the S 300 NC (a former low-floor city bus as a predecessor of the Mercedes-Benz Citaro). The different models of the 200 series also bore the name designations with name suffixes, whereby the designation International (with the letter I appended to the type designation) for travel and combi-buses with simplified heating/ventilation was used. The term Communal and Regional were used for regular services, and Rational for travel combination models. The short-term offered club bus model based on the S 210 H deviated from the name Real. Air-conditioned high-floor buses were called Optimal, the double-deck S 216 HDS Royal and the double-deck S 228 DT Imperial. The export version of the 215 HDH for the US market (later on, the HDH model for the local market was based) was called Transcontinental. Some of these designations still existed with the introduction of the 300 series, as for the S 328 DT, at the latest with the introduction of the 400 series, these name additions with the division into MultiClass, ComfortClass and TopClass were abandoned. Additionally, the name Business has been produced in Turkey since 2013, with simpler equipment. Current Historic Major incidents 2018 Kazakhstan bus fire – On January 18, 2018, a fire occurred in the passenger compartment of a 1989 Setra bus in Kazakhstan, resulting in 52 casualties. The fire was due to an open-flame cooker being used onboard the vehicle, adjacent to fuel canisters being kept in the passenger compartment. Also, on the ITV You've Been Framed special, "Top 100