Metroline frequently cascade vehicles from one route to another, usually with good reason, varying from passenger loadings and vehicle layouts to economy in engineering. One route which has had more than its share of cascades is the 16, which seemed for a time to be getting new vehicles every summer, though the allocation does now appear to have settled down. First to come were Volvo Olympians), as an upgrade from MCW Metrobuses, in 1998. AV 23-38 later moved to the 260 and were replaced by an equal number of new Dennis Trident 2s. Those were the first of what was destined to be a short run of success with Metroline for Alexander, as opposed to the Plaxton President which had been specified earlier (though by MTL, before takeover by Metroline) and subsequently became standard.