The forward P/E of 24.8 against a trailing 39.9 implies the market expects roughly 60% EPS growth, an expectation partially validated by the recent guidance raise, yet the PEG of 1.55 sits more than double the 0.63 recorded at ITT and Allison Transmission, suggesting growth is priced in rather than discounted. The 4.16x price-to-book multiple appears even steeper once the $10.6B goodwill balance is stripped out, meaning tangible book value underpins materially less of the equity claim than the headline ratio implies.

The 420 basis point gross margin trajectory over ten quarters appears consistent with mix shift toward aftermarket and modernization segments, which typically command pricing power that commoditized OE sales do not. Operating margin expansion of 370 basis points, occurring against essentially flat quarterly asset turnover of 0.13-0.14, suggests the gains are margin-driven rather than volume-driven, which tends to be more durable but also more exposed to input cost pass-through failures.

Annualizing the 2.7% quarterly ROIC implies roughly 10.8% on a full-year basis, a meaningful gap versus Trane at 26.2% and Allison at 22.2%, and the gap appears structural given WAB's acquisition-generated balance sheet rather than reflective of operating underperformance. The spread between ROE of 3.6% and ROA of 1.8% in 2026Q3 confirms that nearly half of the equity return is being manufactured by financial leverage, which is a fragile source of return if debt costs rise.

Interest coverage of 7.96x remains adequate and is superior to what a 10.63x debt-to-EBITDA ratio might otherwise suggest, implying current earnings can service the debt load comfortably. However, the coverage deterioration from 8.86x in 2024Q2 to 7.96x, alongside tangible net worth narrowing to roughly $0.8B against $6.8B of gross debt, means the cushion against any EBITDA contraction appears materially thinner than the coverage ratio alone conveys.

The 22-day extension in the cash conversion cycle, driven almost entirely by a 15-day increase in inventory days, is consistent with a build in work-in-process ahead of modernization shipments, though investors should note it may also reflect slower inventory turns. With payables essentially flat at 67-68 days across the period, WAB appears to be absorbing the working capital build itself rather than pushing it onto suppliers, which will pressure free cash flow if shipment timing slips further.