Valmiki Ramayana Sundara Kanda Sarga 7 Shloka 11
Original Shlokaपुष्पाह्वयं नामविराजमानं रत्नप्रभाभिश्च विवर्धमानम्। वेश्मोत्तमानामपि चोच्यमानं महाकपिस्तत्र महाविमानम्।।5.7.11।।
1 source checked for this shloka
तत्र there, महाकपिः great vanara, पुष्पाह्वयम् Pushpaka chariot by name, नामविराजमानम् splendid indeed, रत्नप्रभाभिः glitter of gems, विवर्धमानम् glowing, वेश्मोत्तमानामपि of magnificent mansions, उच्यमानम् tall, महाविमानम् great chariot.
There, the great Hanuman indeed saw a splendid chariot called Pushpaka. It was glowing with glittering gems. Taller than the biggest mansion, it was a great chariot.