Valmiki Ramayana Yuddha Kanda Sarga 71 Shloka 19
Original Shlokaस ध्वजस्सपताकश्चसानुकर्षोमहारथः । चतुस्सादिसमायुक्तोमेघस्तनितानि ।।6.71.19।।
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सध्वजः the standard, सपताकश्च and the flag, सानुकर्षः axletree, मेघस्तनितानि emitting sound like the rumblings of cloud, महारथः great chariot, चतुस्सादिसमायुक्तः driven by four charioteers.
"His chariot with standard, flag and axletree is a great one driven by four charioteers emitting sound like the rumblings of clouds."